CHERNOBYL, UKRAINE - APRIL 05: Bypass channel for cooling at the Chernobyl nuclear power plant in the Exclusion Zone, Ukraine, April 5, 2017. The Chernobyl nuclear accident occurred on 26 April 1986 in the No.4 light water graphite moderated reactor at the Chernobyl Nuclear Power Plant near Pripyat. An estimated 47,000 people of the city of Pripyat were evacuated after the explosion in 1986. Ukrainians will mark the 31st anniversary of Chernobyl's tragedy on 26 April 2017. (Photo by Vitaliy Holovin/Corbis via Getty images)
